//>>excludeStart('excludeRequireCss', pragmas.excludeRequireCss)
/*
 * css.normalize.js
 *
 * CSS Normalization
 *
 * CSS paths are normalized based on an optional basePath and the RequireJS config
 *
 * Usage:
 *   normalize(css, fromBasePath, toBasePath);
 *
 * css: the stylesheet content to normalize
 * fromBasePath: the absolute base path of the css relative to any root (but without ../ backtracking)
 * toBasePath: the absolute new base path of the css relative to the same root
 * 
 * Absolute dependencies are left untouched.
 *
 * Urls in the CSS are picked up by regular expressions.
 * These will catch all statements of the form:
 *
 * url(*)
 * url('*')
 * url("*")
 * 
 * @import '*'
 * @import "*"
 *
 * (and so also @import url(*) variations)
 *
 * For urls needing normalization
 *
 */

define(function() {
  
    // regular expression for removing double slashes
    // eg http://www.example.com//my///url/here -> http://www.example.com/my/url/here
    var slashes = /([^:])\/+/g
    var removeDoubleSlashes = function(uri) {
      return uri.replace(slashes, '$1/');
    }
  
    // given a relative URI, and two absolute base URIs, convert it from one base to another
    var protocolRegEx = /[^\:\/]*:\/\/([^\/])*/;
    var absUrlRegEx = /^(\/|data:)/;
  
    // given a URI, remove '..' if possible
    function normalizeURI(uri) {
        return removeDoubleSlashes(uri).split('/').reduce(function(prev, curr, idx) {
            if (prev.length === 0 || curr !== '..') {
                prev.push(curr);
            } else {
                prev.pop();
            }
            return prev;
        }, []).join('/');
    }
  
    function convertURIBase(uri, fromBase, toBase) {
      fromBase = normalizeURI(fromBase);
      toBase = normalizeURI(toBase);
      if (uri.match(absUrlRegEx) || uri.match(protocolRegEx))
        return uri;
      uri = normalizeURI(uri);
      // if toBase specifies a protocol path, ensure this is the same protocol as fromBase, if not
      // use absolute path at fromBase
      var toBaseProtocol = toBase.match(protocolRegEx);
      var fromBaseProtocol = fromBase.match(protocolRegEx);
      if (fromBaseProtocol && (!toBaseProtocol || toBaseProtocol[1] != fromBaseProtocol[1] || toBaseProtocol[2] != fromBaseProtocol[2]))
        return absoluteURI(uri, fromBase);
      
      else {
        return relativeURI(absoluteURI(uri, fromBase), toBase);
      }
    };
    
    // given a relative URI, calculate the absolute URI
    function absoluteURI(uri, base) {
      if (uri.substr(0, 2) == './')
        uri = uri.substr(2);
  
      // absolute urls are left in tact
      if (uri.match(absUrlRegEx) || uri.match(protocolRegEx))
        return uri;
      
      var baseParts = base.split('/');
      var uriParts = uri.split('/');
      
      baseParts.pop();
      
      while (curPart = uriParts.shift())
        if (curPart == '..')
          baseParts.pop();
        else
          baseParts.push(curPart);
      
      return baseParts.join('/');
    };
  
  
    // given an absolute URI, calculate the relative URI
    function relativeURI(uri, base) {
      
      // reduce base and uri strings to just their difference string
      var baseParts = base.split('/');
      baseParts.pop();
      base = baseParts.join('/') + '/';
      i = 0;
      while (base.substr(i, 1) == uri.substr(i, 1))
        i++;
      while (base.substr(i, 1) != '/')
        i--;
      base = base.substr(i + 1);
      uri = uri.substr(i + 1);
  
      // each base folder difference is thus a backtrack
      baseParts = base.split('/');
      var uriParts = uri.split('/');
      out = '';
      while (baseParts.shift())
        out += '../';
      
      // finally add uri parts
      while (curPart = uriParts.shift())
        out += curPart + '/';
      
      return out.substr(0, out.length - 1);
    };
  
    var normalizeCSS = function(source, fromBase, toBase) {
  
      var urlRegEx = /@import\s*((?:"([^"]*)")|(?:'([^']*)'))|url\s*\(\s*(\s*(?:"([^"]*)")|(?:'([^']*)')|[^\)]*\s*)\s*\)/ig;
      var result, url, source;
  
      while (result = urlRegEx.exec(source)) {
        url = result[3] || result[2] || result[5] || result[6] || result[4];
        var newUrl;
        newUrl = convertURIBase(url, fromBase, toBase);
        var quoteLen = result[5] || result[6] ? 1 : 0;
        source = source.substr(0, urlRegEx.lastIndex - url.length - quoteLen - 1) + newUrl + source.substr(urlRegEx.lastIndex - quoteLen - 1);
        urlRegEx.lastIndex = urlRegEx.lastIndex + (newUrl.length - url.length);
      }
      
      return source;
    };
    
    normalizeCSS.convertURIBase = convertURIBase;
    normalizeCSS.absoluteURI = absoluteURI;
    normalizeCSS.relativeURI = relativeURI;
    
    return normalizeCSS;
  });
  //>>excludeEnd('excludeRequireCss')
  